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David Fowler 🇧🇧🇺🇸 Profile picture
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Sep 22 • 4 tweets • 2 min read
OK C# coding challenge from today's discussion. This came up today in the context of "async and concurrency is *HARD* even for very experienced developers". I will share some techniques after seeing some answers. #dotnet #csharp
First version is using a CancellationToken
Using new primitives in .NET 6 this was one of the cleanest I could come up with:
What about using a timer directly?

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More from @davidfowl

David Fowler 🇧🇧🇺🇸 Profile picture
Sep 20
Declarative VS imperative, which do you prefer and why? #dotnet #aspnetcore ImageImage
What about now? ImageImage
I don't think one of these is better than the other, but to show how removing indirection can make the understanding of what the code is doing simpler: ImageImage
Read 4 tweets
David Fowler 🇧🇧🇺🇸 Profile picture
Jul 8
Here’s another “auth is hard in .NET” thread reddit.com/r/dotnet/comme… #dotnet #aspnetcore
To help the team contextualize why it is hard outside of the domain itself being hard, it would be great to see some code samples. Samples from other frameworks that are runnable. Most of these threads conflate everything under the auth banner and require 20 questions understand
the problem. It’s fine to rant but we want to make real improvements. After the rant please show the code. We need to understand the scenario, the exact scenario. Sharing code leaves less room for ambiguity.
Read 10 tweets
David Fowler 🇧🇧🇺🇸 Profile picture
Jun 27
COVID will be “over” when people stop posting tests results on Twitter. It’s not “normal” or “endemic” yet socially. It feels pretty inevitable at this point, there’s still a guilt associated with having it (you could have spread it unknowingly).
It’ll be “like the flu” and “normalized” socially when people stop doing that. So, IMHO Covid isn’t “over” yet…
As an example of what this “new normal” feels like: Hanging out with people and then waiting for 3-5 days to pass to see if you have any symptoms. Knowing you have to travel in a week and trying to reduce the possibility of getting it by reducing too much human infraction before.
Read 5 tweets
David Fowler 🇧🇧🇺🇸 Profile picture
Jun 27
This thread was good because it helped clarify my thinking. There are 2 phases (for simplicity) where ClaimsPrincipal shows up:
- The authentication flow
- The authorization flow

Claims are typically used to store authentication data. #dotnet #aspnetcore 🧵👇🏾
That data is then used to look up more user information (profile data) usually store in a database/cache. This profile data usually also contains permissions and authorization rules are then run over this user for different types of application "resources".
These resources typically include (but are not restricted to):
- The HTTP endpoint
- Some business object

The authorization process usually needs access to all user profile information including permissions to do authorization checks.
Read 11 tweets
David Fowler 🇧🇧🇺🇸 Profile picture
Jun 26
The oral history of Dave Cutler is a real gem:
Part 1:
Part 2:
Windows NT is a marvel of an operating system and his work has been immensely impactful on the industry at large. I also love that he's an engineer through and through.
Some gems:
- Engineers should care *deeply* about the quality of the code they write (he hated when he had bugs assigned to him).
- Coding != Software engineering. They brought strong engineering culture to Microsoft from DEC.
- Go interview elsewhere to know your worth😉.
Watching these luminaries, I see a pattern of small teams of highly capable people building largely impactful software projects.
Read 4 tweets
David Fowler 🇧🇧🇺🇸 Profile picture
Jun 15
New feature that came out with minimal APIs in .NET 7 preview 5 (devblogs.microsoft.com/dotnet/asp-net…), the ability to declare parameter list surrogates: #dotnet #aspnetcore
You can refactor long argument lists into structs as a "zero cost abstraction". The struct's members will be bound as if they were parameters declared on the method.
It's not all or nothing, you can also do this with a subset of the parameters:
Read 5 tweets

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